Electric-light-adjusting socket.



D. YAMABA.

ELEGTRIG LIGHT ADJUSTING SOCKET.

APPLICATION FILED NOV. 17, 1913.

Patented Get. 20, 1914.

UNITED sra'rns DAIJI YAMADA, OF SANTA ANA, CALIFORNIA.

ELECTRIC-LIGHT-ADJUSTING SOCKET.

Specification of Application filed November To all whom it may concccnBe it known that I, DAiJr'YAMAnA, a subjectof the Emperor of Japan,residing at Santa Ana, in the county of Orange and State of California,have invented a new and useful Electric-Light-Adjusting Socket, of whichthe following is a specification.

This invention relates to a socket for receiving and making electricconnection with an electric lamp bulb, ard provided with means foradjusting or r dating; the intcnsity of the light furnished said bulb,andthe main object or the pi nt invention is to provide an effective aiminiplc device of this character which will pa -wide for severaldifferent intensities of lie-ht.

Another object 0:" the lYclitlOn is to provide nicans for srzteguardine'the device against excessive ne of "lili'illt.

Ether objects of the iii-motion will hereinafter.

The accoinpanyin drawings illustrate the invention, and refer 1gthereto:

Figure 1' is a vert'cal section of the socket with a portion of the bullFig. 2 is a perspectire View of the circuit controlling means withelectric connections thereof shown diagrann'natically.

The so t comprises an upper head 1 provided w l a metallic shell 2,cylindrical appear Letters Patent Patented Oct. 20, 1914.. 17, 1913.Serial No. 801,414.

bulb 21, and a central contact 22 onithe lower head 4- adapted to makecontact with the central contact 2 on the base of the lamp bulb. Saidcontact head 22 is formed as a head of a metallic pin 24- having ascrewthreaded portion 24' screwed in the lower head l and extendingtl'u'ough the same, the upper part of pin 24 being cylindrical andengaging at its upper end with the contact spring aforesaid.

A spool 28 of insulating material is bored as shown at 27 to revolublyfit on the upper portion oi the pin 24 and rests at its lower end on thelower head 4: on the socket. 011 the upper end of this spool is secureda metal ring 29 which engages with the contact spring 16 aforesaid so asto maintain continuous contact therewith in the rotation of the spool. Acontact spring 30 supported on an insulating block 31 on the side of thecas ing 3 is connected by a wire 32 to the socket ring 18 and is adaptedto engage with any one of a series of contacts 33, 3, 33. 33 and 3 -3 onthe upper disk of the spool 28. Said contacts may consist of screwsscrewed into the said upper member of the spool and are connectedrespectively to resistances wound on said spool as hereinafter setforth. Spool 28 is provided. preferably at its lower head, with a gearwheel 35 consisting, for

casing 23 connected to said shell 2, and a lowcr hcad i secured to thelower end of said casing. l he shell 2 of the upper head It is-bentinwardly over the upper head 1 and extended upwardly to form a. neck 5attached screw '3 to a knob or support 7 he lower end of which extendswithin s id neck. The knob 7 and head .1 are of in lilting; inater'aland are bored as shown at and 1, respectively for passage of the lampcord. indicated at the two wires 11 am 15-2 of said lamp cord being bentunder die head i secured thereto by screws 13 and .4- which also serveto fasten in position n siriid head, contact springs 15 and 16.llhecasing' 8 is provided with ventilating perf irations 10. Said usingis remorably fast: nod to the shell 2 by screws 17 and the lower end ofsaid casing is bent inwardly arouiod .helower head and extended downwaivflly to form a sheath or housing 9 for the lamp socket proper. Said'lanip socket consists of an outer screw-threaded ring 18 fastened byscrews to the bottom-ct lower head l arl adapted to make exanu'ile, of acircular band secured to said lower head and having crown teeth or serrations on its upper edge. A shaft 37 mounted ina bearing 38 on the sideof casing 3 carries a. pinion 39 engaging the Q8211" aforesaid. saidshaft being provided with an operating" button or handle 40, wherebysaid pinion may be rotated to turn. the gear wheel 85 and the spool 28.

The spool 28 is wound with a series'or resistance wires 36 of suitableconducting material. preferably insulated with asbestos. is indicated in2,, these resistance wires or sections of resistance are connected in Iseries. the first resistance section being connected at one end to thefirst contact 33 on the upper spool head and. being connected at itsother enc to the second contact 33 the second resistance being connectedat one end to the second contact 33', and at its other end to the thirdcontact 33, and so on until the final contact is reached. A fuse wire orsuitable fusible material is connected to the t contact 33 and to thecontact ring 29 a l oresaid.

contact with the screw ring 20 on thelamp.

, an operation is as follows: W hen the lamp is not in use the Contactspring 30 is out of contact with all of the contacts 33 etc., so thatthe circuit is interrupted. When it is desired to light the lamp, theknob or handle 40 is turned so as to rotate the spool 28 through theoperation of gears 39 and 35, thereby bringing the first contact 33 intocontact iriththe spring 30, whereupon current will flow from the circuitwire 11 through contact spring 15, pin 24, head 22, through the lampfilament to contact rings 30 and 1S and by wire 32- to contact spring30, contact 33, fusible wire 4K2 to contact ring 29 thence throughcontact spring 16 to the other circuit wire 12. The circuit so traceddoes not include any resistance except that of the lamp itself, so thatmaximum current will flow in this case and the lamp will be operated atits full intensity.

20 By turning the knobld farther, the second contact 33 is brought intocontact with the contact spring 30 and the current will then pass asabove traced until it reaches contact s ring 30, whence it will pass tothe second contact 83 and thence through the first section of resistancewire 36 to contact 33* from which it passes to the other side of thecircuit as above traced. As one of the resistance sections 36 is nowincluded in circuit, the amount of current passing through the lamp willbe correspondingly diminished and the intensity of illumination will bedecreased, and similarly by turning the knob L0 still farther, two,three or more of these resistance sections may be included in series inthe circuit with the lamp, so as to decrease the illumination to anyrequired extent.

, What I claim is:

40 1. An electric lamp socket provided with means for attachment thereto01": an electric lamp bulb and with connections for said bulb and for anelectric supply circuit, a

, member rotatably mounted on said socket and provided with a series ofresistance sections, contacts carried by said rotatable member andconnected to said wires, fixed contact cooperating with the aforesaidcontacts, and electric circuit connections in eluding said fixed andmovable contacts for connecting one or more of said. resistance sectionsin series with the electricla-mp, according to the rotative position ofsaid rotatable member, and means for rotating said rotatable membercomprising a handle outsupported thereon, a spoolrotatably mounted onsaid pin, series of resistance sectlons wound on said spool, a series ofcontacts on said spool connected respectively to said resistancesections, a contact spring mounted on said casing and adapted 1 tocooperate with said contacts on said spool, electric supply circuitconnections connected to the lamp andto said fixed contact for includingone or more of said resistance sections in series with the lampaccording to the rotative position of said spool, means for rotatingsaid spool, comprising a gear member carried by said spool, a shaftrotatably mounted in said casing, a pinion carried thereby, engaging theaforesaid gear member, and a handle on said shaft.

3. An electric lamp socket comprising a casing provided at one end withtwo contact springs for connection respectively to the wires of anelectric supply circuit, a pin ex tending centrally in said casing forengaging one of said contact springs, a spool rotatably mounted on saidpin, a contact ring carried by said spool and engaging the other of saidcontact springs, a series of contacts carried by said spool andconnected to said contacts, a fixed contact spring engaging the contactscarried by said spool, and contact means carried by said socket forengagement respectively with the terminals of an electric lamp bulb,electric lamp bulb, oneof said contact means being connected to saidpin, and the other of said contact means being connected to theaforesaid contact spring cooperating with the series of contacts on thespool, a gear member carried by said spool, a shaft rotatably mounted insaid casing and provided with an operating handle, and a gear membercarried by said shaft for engaging the aforesaid gear member on saidspool in testimony whereof, I have hereunto set my hand at Los Angeles,California, this 7th day of November, 1913.

DAIJI YAMADA.

Witnesses i A. l liNlGHl, Lonaiunr; E. Deacon.

